Furnace drum



July l, 1930, l H W NEAL L'f FURNACE DRUM Filed Oct, 2]. 1929 2Sheetsheet 1 IIHIIHHIHIHIHIIIIHH ilIIHIHIIIIHILIIIHIIHll uwHllllllllllnmllnnlnum.

-HHnummmmwwwwWWW"' H. w. NEAL FURNCE DRUM July 1, 1930.

. 1929 2 Sheets-Smet 2 Filed Oct. 21

Patented `luly 1, 1930 il unir-eo STATES Parlnrlg orifice COMPANY, OF.INDIANAPOLIS, INDIANA.. j y

FURNACE DRUM Applicatin filed etober'Zl, 1929. Serial No. 401,073.

This applicationwrelates to furnaces particularly ofthe type adapted toheat build-v ings by currents of warm air and is directed Yto aradiating drum employed in. connec- Stion therewit j j j It istheprimary object of the invent-ionto provide a conducting andradiatingsurface that may be heated directly from one side and a currentof airdrawn acrosslthe other l@ sidewithout intervening jointstherebetween. Another important object is the'buildlng up of a heatingsurface 'from 'a plurality of sections to provideintegrallyformedradiating fins. Other objects reside in lthe .unique formation lofa drum from sheet metal that maybe air tight and extremely durable underall of the conditions encountered in a furnace.

These and other objects will `become -apg@ parent in the followingdescription of the invention as illustrated by the accompanyingdrawings, in which Fig. 1 is a front elevation of a furnace to which myinvention is applied and with g5 the outer housing removed;

Fig. 2, a rear elevation;

Fig. 3, a horizontal transverse section on the line B-Sin Fig.V 1;

Fig. 4, a vertical sectionon the line 4 4 3 in Fig. 3; and l Fig. 5, avertical section on the line 5--5 in Fig. 4.

Likecharacters of reference indicate lil-:e

parts throughout the several views in the.

, 45 formed to the desired curvature of the completed drum. The oppositewall of the drumy 13 is formed in a similar fashion by placing togetherone after another the sections 14 each having theout-turned tins 15 and16 5o in respective contact onewith another and welded onev totheotherjaround their `outer edges, the entire `welding operation beingconfined along the edges and noton the side faces. The two walls soformediare united by the'end pieces v17 and 18 each having4 ver` ticallydisposed ins adapted to contact the fins at the end of each of the wallsand to` be welded thereto along their edges.

Itis to be observed that this structurenot f At the `top and bottom endsof the wallsv are the sheet metalclosures 19`andf20, U- shaped in crosssection to have outwardly turnedflanges with faces in direct contactwith the vertical faces of the vinner and outer walls. These twoclosures are held in place and united to the various sections 10 and.14, by welding along the eXtreme f.'

edges of the sections and legs ofthe two closures. By welding along theedges of two pieces ofmetal havingfsubstantial contacting area back ofthe edges, the welding operation is vreducedjto a minimum as well asbeing easier to perform than where one .piece of metal abut-s another,and additionally.V permits the forming of ajoint that maybe i ing toundergo tests. j.

j The upperand lower closures 19 and -20 unitey the various sections 10and 14 into a rigid unitary structure, that though light in weight isextremelyv durable.

readily observed to be airtight without hav#y ,I employ Ythe usual typerof fire box and dome 30, and preferablyuse two drums constr-ucted as4above fexplained. F romr the upper forward part of the dome '30 Iprovide two outwardly projecting fiues 21 and 22and by means of theattaching ianges 23 and24: secure .thereon the connections 25 and 26 ofthe drums 13, Fig; 1.; The connections 25 and26` are in. thel upperforward ends of thedrums; f Y, v y y The drums 13 arey spacedoutwardlyfrom the dome by means of the above described attachment and curvearound the dome to have their rear ends approach one another. Dischargefiues 28 and 29 lead from the lower rear ends respectively of the drums13 andare carried around rearwardly in parallel relation one with theother to discharge into the collecting box 40 from which there is a fluepipe opening 8l. It is to be noted that the adjacent walls of the flues28 and 29 form a Vdividing wall 32 in the box 40 whereby the escapinggases enter the box in two streams flowing in the same direction so thatno turbulence is produced by conflicting currents.

The drums are preferably supported at the rear by extending ears 33 and34 from one of the fins 15 on each drum to be engaged by vbolts 35passing through the ears and brackets 36 fixed on the dome 30.

I claim: l. A furnace drum comprising a plurality of sheet metalsections each having a fin out-turned from each of the two verticaledges, said sections being united consecutively one to another by havingadjacent fins contacted and secured one to the other, and said sectionsbeing shaped one after another between said fins to define the shape ofthe drum.

2. A furnace drum comprising a plurality of sheet metal sections eachhaving' a fin out-turned from each of the two vertical edges, saidsections being united consecutively one to another by having adjacentfins contacted and secured one to the other, and said sections beingshaped one after another between said ins to define the shape ofthedrum, said legs being extended an appreciable distance from saidsections to form radiating fins about the drum.

3. A furnace drum comprising a plurality of sheet metal sections eachhaving a fin out-turned from each of the two vertical edges, saidsections being united consecutively one to another by having adjacentfins contacted and securedone to the other, and said sections beingshaped one after another between said fins to define the shape of thedrum, and top and bottom closures each having a flange turned outwardlyfrom its edge therearound to contact and be segired to said sections.

4. A furnace drum comprising a plurality of sheet metal sections eachhaving a iin out-turned from each of the two vertical edges, saidsections being `united consecutively one to another by having adjacentfins contacted and secured one to the other, and said sections beingshaped one after another between said fins to define the shape of thedrum, said Viinsbeing extended an appreciable distance from saidsections to form vradiating fins about the drum, Yand said fins beingsecured one to the other by welding their adjacent outer edges only.

5. In a furnace, a fire-box having a pair of upper, forwardlydischarging flues, a radiating drum on each side of the fire-box spacedtherefrom and connected with said lues at their upper forward ends, acollecting box at the rear of the fire-box, discharge flues leading fromthe rear ends of said drums and entering said collecting box one flueparallel to the other, and radiating fins projecting inwardly from saiddrums toward said fire-box, said fins terminating at a distance from thefire-box, and ears extending from vfins and secured to the fire-box.

6. In a furnace, a fire-box having a pair of upper, forwardlydischarging fines, a

radiating drum-on each side of the fire-box spaced therefrom andconnected with said flues at their upper forward ends, a collecting boxlat the rear of the fire-box, discharge ilues lleading from the rearends of said drums and entering said collecting box one iiue paralleltothe other,`and radiating fins projecting inwardly from said drumstoward said ire-box, each of said drums being built up of a plurality ofpreformed sheet metal sections individually shaped to conform to theshape of the fire-box, the vertical edges of each section beingout-turned to contact correspondingedges of adjacent sections, saidout-turned edges being united to form said fins,

In testimony whereof I aiix my signature.

HARRY WV. NEAL.

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